Optical Touch Panel Outermost Region Signal Correction
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Solution Overview
Problem
Optical touch panels in image display devices face challenges in accurately detecting proximity objects due to reduced signal intensity in the outermost regions of the effective display area, caused by shading layers, leading to potential position detection errors.
Innovation Solution
An information input device with an input panel featuring photodetectors in an effective photo-detectable region and a shading region, incorporating an outermost-region correction mechanism to enhance signal intensity, allowing for accurate detection of proximity objects by correcting photo-detection signals from photodetectors in the outermost regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a shading layer is formed in the frame region, then the display quality is improved, but the photo-detection signal intensity in the outermost region is reduced
Solution Approach 1:
The patent applies parameter changes by introducing a correction factor that modifies the photo-detection signal based on the position of photodetectors. The correction factor compensates for the reduced light intensity in outermost regions by adjusting the signal parameters mathematically, thereby maintaining uniform detection accuracy across the entire display surface despite the presence of the shading layer.
Solution Approach 2:
The patent implements feedback by using the position information of detected objects to adjust the photo-detection signal through a correction factor. The system continuously monitors detection signals from photodetectors in different regions and applies position-dependent correction to compensate for the shading effect, ensuring accurate position detection throughout the display area.
2Strength
If a protective glass or acrylic plate is attached on the display surface, then the display durability is improved, but the photo-detection signal intensity is further reduced
Solution Approach 1:
The patent addresses this contradiction by modifying the photo-detection signal parameters through a correction factor that accounts for the additional light attenuation caused by protective glass or acrylic plates. The correction factor adjusts the signal intensity based on photodetector position, compensating for the combined effect of the shading layer and protective covering to maintain uniform detection accuracy.
3Area of stationary object
If photodetectors are arranged in the outermost region, then the detection coverage is improved, but the signal intensity uniformity deteriorates
Solution Approach 1:
The patent applies local quality by implementing position-dependent correction factors that are specifically tailored for photodetectors in different regions of the display. Outermost region photodetectors receive different correction values compared to inner region photodetectors, allowing each location to be optimized for its specific light intensity conditions while maintaining overall system uniformity.
Solution Approach 2:
The patent uses parameter changes by introducing correction factors that modify the photo-detection signal based on the spatial position of photodetectors. This mathematical adjustment equalizes the effective signal intensity across all photodetectors regardless of their position, enabling uniform detection precision throughout the entire detection coverage area.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution improves the in-plane evenness of photo-detection signal intensity, enabling high-accuracy detection of proximity objects by compensating for reduced signal strength in the outermost regions, thereby enhancing the reliability of position detection.
Implementation Method 1
an optical touch panel that optically detects a finger or the like... receives light, which has been output from the display surface and reflected by a proximity object such as a finger, by photodetectors arranged on the display surface to detect a position of the proximity object
Data Source
AI summary
An information input device includes: an input panel having an effective photo-detectable region in which a plurality of photodetectors are arranged for detecting an external proximity object, and having a shading region located in a margin of the effective photo-detectable region; a correction section performing outermost-region correction on an outermost photo-detection signal to increase intensity thereof, the outermost photo-detection signal being obtained from a photodetector located in an outermost-region of the effective photo-detectable region; and an image processor acquiring object information about one or more of a position, a shape and size of the external proximity object based on a resultant photo-detection signal obtained from the outermost-region correction.